Filter panel



March 7, i950 c. J. GLANzr-:R ET AL 2,499,949

FILTER PANEL Filed July 19, 1945 Y 2 Sheets-Sheet l /NVENIMJ CLAnEn/c: JT GLA/VIER Ouvsfe H. Jef/AAF March 7, 11950 C. J. GLANZER ET AL l FILTER PANEL 2 Sheets-Sheet 2 Filed July 19, 1945 l/vvnvrons. CLARENCE J.' GLM/2ER 01. lvm H. JcHAAF TTRNEYJ.

Patented Mar. 7, 19H5 SchaaLShaker Heights, Ghia, assignorsto.Air-y Maze Corporation,4 Cleveland', Ollie,A .a V0.01110- -ration of Delaware Application July19, 1945i,V Serial No. 6055878 (c1. 18s- 7m 3;: Claims.

l This invention relates `to improvements in a lter panel often referred toV inthe trade` as of the dry typeA lwherein one or more` strips of filter material is supported in a manner to. retain particles collected from a dirt-bearing lgaseous stream, theV lter material being removable -for separate cleaning or for replacement.

An object of the present invention is lio-provide a. novel-arrangementof subframes or cells adapted to .be-'assembled in plural in a panel to support filter material, and easily disassembled for re..- moval or replacement of the lter material.

Another object of the invention is to vprovide a-device as above-described wherein the cells are of uniform construction and capable of- Iassembly in a complete unit by simplyreversing the position of every other cell.

Another object of the present invention is to provide a novel manner of sealing the cells and the `holding frame against gaseous leakage by' use of the lter material itself.

Another object of the invention is to :provide novel lter-supporting structure-associated with the cells.

Still another object is theprovisicn of novel reinforcement for the cells `overa..crmsi'deralz'le span so as to prevent sagging ofthe cells'or 'of the filter material held thereby.

Other objects and advfantagesof our'invention will be apparent from theraccompanyingfdraw'- ings and description, and the..essential-features thereof will `be set forth in thev appendediclaims.

Inthe drawings,

Fig. 1 is a front elevational `View of av filter panel constructed according to our inventiongwith portions ofthe panel frame broken-.away'tofzmeie clearly show the construction;

Fig. 2 is an enlarged perspective fvieW ;of Ithe end portion of one of the cells ,ofxFig 1;

Fig.v 3 is a transverse .sectionalview `taken. along the line 3 3 of Fig.v 1;

Fig. 4 is an'enlarged .perspective 'viewof-the.

end portions of several cells of modied form withcertainparts of thesubframes broliemaway 5o more clearly show theconstruetion;

Fig. 5 is a perspective View simi1ar.to.Fig.4- and showing another modied form ofzour device;

Fig..6 is'a sectional view taken along the linei-G of Fig. 5;

Fig. 7 is a perspective view of .a cell subframe 'aken from the position similar to Fig. 'Zand lhowing still another modified form;

Fig. 8 is a plan view of a sheet .blankwhieh night be used in forming certain of' thecells areviously described; while Fig; 9 is a small perspective View similar to Figs. 4 and 5 showing still another modification of ourv invention.

Certain lteringprobl-'ems vare best metA by meansof a stripof lter material properly sup-s ported in the gaseous stream in a manner to receiveI dirtl particles and hold the same, after which the dirty strip. lis removed leither to. be cleaned andy reused or to bei-thrown away and replaced by a new strip. In this. type of lter the istrip fmaterial is quite often dry although there isno'reason- `why our l.invention might not be used with strip material coated. :with some viscous :adhesive for holdingthedirt. particles where they impinge upon-the filter media. The strips of flter material lhereinafter referred to will beunderstood to-be of any suitable medium. Quite'oftenthey are ofwporous. cloth., paper or; the like, but any other flexible porous lter maf. terialmight beuse-d-.where required for a special filtering job.

the device shown in Figs. 1, 2,.,and 3, a plu-E rality of generallyU--shape subframes .lll are piled one-on top ofthe other withinthe holdingframe H with the :open sideof the cells marked' .lila turned-toward theface A of the .paneland the open side Illb` of the alternate cellsturned. toward therace-B ofsthe panel. Referring morezparticue larlytoFig'. -2,it will benoticedthat each of .the subframes comprises an imperforate Ycentral web l2 with sideiflanges 12a extending .at rightv angles thereiromand `,forming the legs. of the Ufform cell. vItwillbe noted that'the major .portion .oil the legs l2wareioraminous, andfin this particle.y

- larform-of our-device, :this is provided bylcllttipg the: openings 12b to form .windows extending over thermaicrzportion .of the .area .of the cell .Sides and securing asheet of screen material i3 across these windows to As lipport the lter material as will `presently appear.

Referring now to Fig. le with a plurality of the subframes l0 available,r a strip of lter material I4 isplaced 4along the bottom of the frame l'l extending vover the entire side of the fra-marroni' front torear `and from side to side along the stretch of material Ma as clearly'seen inFigls. 1' and 3. Thebottom cell lll is then placed ori-the' strip 14a-with its open side Illa toward rthe* face' Aiofthelter-panel. The strip of lterfmaterial is-then folded vertically upward. around the-openend of the cell at thepointillb. as; seenin'Fig. l.. Another stretch ldcvof'the-material is then folded. liaclcgacrossthe entire length and Width'of the; panel; parallel tothe stretch I4@ r after which the; nextcell misplaced on the strip ltcwithrits` open side Ib facing toward the panel face B. The lter strip is then folded around the open end of this second cell I at the point I4d, and this operation is continued folding the strip of filter material back and forth across the panel between every two adjacent cells or subframes I0. Thus a continuous strip of filter material may be folded into one complete panel making it very easy to assemble and disassemble the device and to clean or replace the lter material. A later description will show how separate strips Vmay be used at Ia, I4c, etc. if necessary or desirable.

In the device just described, a dirt-bearing gaseous stream will be compelled to enter through the face B of the panel (when the same is placed in a suitable duct) and following the arrows will travel through the cell openings Ib, then through the screens I3 which support the filter strips across their entire area, then through the lter strips Illa, Ide, etc., and then out through the C811 Openings Ina on the downstream side (face A) of the panel.

In the modification of Fig. 4, the construction is in most respects similar to that already described with the following differences. Here each of the cells I5 has an imperforate central web I5a and parallel side walls l5b extending at right angles thereto but provided at the free ends of the U-form section with anges I5c extending outwardly at right angles to the side walls I5b. Preferably also, the ends of the cells are closed by an imperforate end wall I5d as shown broken away in Fig, 4. Here again the side walls I5b are provided with the windows I6 which are covered by the screen material I1. A plurality of these cells, all of which are identical as shown, are assembled in a fashion similar to that described in connection with Figs. 1 and 3 with the open side of every other cell toward the face B of the panel and the intermediate cells having open sides facing toward the face A. Here, however, the strip of lter material I8 is wider than the dimension of the side wall I5b between the web I5a and the flange I5c. As clearly shown in Fig. 4, the strip of filter material is wide enough to provide marginal edges 18a which -lie between each of the flanges I5c andthe web I5a of an adjacent cell or subframe. In this manner, leakage of the gaseous stream or bypassing these overlapping points is prevented.

It will also be noted that the flanges I5c provide stiifening members along the longer dimension of the cells I5 so as to prevent sagging of the walls I5b in the center of the span in cases where the panel is of considerable width. The form shown in Fig. 5 is exactly like that shown in Fig. 4 except that windows I6 in the side Walls I5b are left open. In this modification, means is provided for supporting the strip I8 of lter material across the area of the windows I6 by placing a length of stiff screen material I9 bent in Zig-zag form as clearly shown in Figs. 5 and 6 in each U-shape cell. The screen I9 preferably extends substantially the full depth of each cell resting on the wall I'5a thereof and having the ridges I9a of the screen pressed against the side walls I5b of the cells. These ridges Illa may be spaced sufficiently close together to provide a firm support for the filter strip I8 entirely across the width of the panel. At the same time, the screens I9, each of sufficiently stiff material, provide a certain rigidity preventing collapse of the parallel side walls I5b of each cell. This is in addition to the stiffening effect of the flanges I5c referred to in connection with Fig. 4.

Another manner of forming the subframes is indicated in Fig. 7 wherein a single sheet of metal or the like is bent in U-form to provide the central web 20a having parallel side walls 20D substantially at right angles to the web 20a. At the open side of the cell, the flanges 20c may be turned outwardly from the side walls as previously described in connection with the flanges I5. The side walls may be perforated as indicated at 2I to provide for flow of a gaseous stream therethrough and to support the lter strip I4 or I8 in a manner previously described in connection with the other modifications. If desired, the stiffening deformations, such as the ribs 20d, may be provided in the side walls 20h extending crosswise of the panel to prevent sagging of the subframe in the central portion of the panel.

Where the cells have closed ends, as indicated at I5d, there is no problem of gas leakage. Where the ends are open, the reliance may be had upon a filter strip I4 or I8 of soft cloth material which will rest snugly between the side wall II of the panel frame and the open end of the cell so as to provide a very good closure at that point.

Where the open end of the cell is closed as by the wall I5d, each cell may be formed of a single blank 0f sheet material as indicated in plan in Fig. 8. Here the web I5a, the side walls I5b, and the anges I5c are laid out on a sheet of material to which the end wall I5d may be integrally attached as indicated in Fig. 8. It is obvious how this blank may be folded on the dotdash lines indicated to give a cell like that shown in Fig. 4. For ease in attaching the end wall I5d to the side walls, the flanges I5e may be provided folded at right angles to I5d and attached to the side walls I5b in the completed form.

While the various forms of our device have been thus far described as providing a central web such as I2 or I5a and parallel side walls at right angles thereto, it should be understood that we contemplate other forms of our device such as that shown diagrammatically in Fig. 9. Here the imperforate web 2| a is provided with side walls 2Ib diverging therefrom and alternate cells open in opposite directions to carry out the same construction as previously described. It is obvious that identical cells may be used facing upstream and downstream with the filter strip I8 placed between adjacent side walls 2lb to provide the same filter effect as in the cases where the cell side walls are parallel.

While we have described the use of a single strip of filter material I4 or I8, it is obvious that individual lengths of material, as shown at I4a 'or I4d, might be provided without departing from the spirit of our invention. We find, however, that it is more dimcult to handle a large number of separate strips and, therefore, we prefer one continuous strip or at least a strip long enough to make several lengths of material back and forth across the panel.

What we claim is:

1. A lter panel having upstream and downstream faces and comprising a main frame, separate hollow subframe members wholly unconnected with said main frame, one member providing a cell open at said upstream face only for stream ingress and adjacent members providing cells open at said downstream face only for stream egress, said subframe members being identical in shape but in alternately reversed position, said cells having walls providing Stream flow between them, iiexible sheet filtering material between adjacent cell walls and lling the stream flow space between them, and a stii foraminous sheet folded in Zig-zag form inside o each cell and engaging the walls thereof and said flexible sheet filtering material, whereby to support said cell walls and to hold said filtering material in place.

2. A filter panel having upstream and downstream faces and comprising a main frame surrounding the sides of said panel and open at said faces, said frame being channel form in section having an imperforate web and iianges overlying said faces, separate hollow subframe members wholly unconnected with said main frame, one member providing a cell open at said upstream face only for stream ingress and adjacent members providing cells open at said downstream face only for stream egress, said subframe members being identical in shape but in alternately reversed position, said subframe members extending from said frame web on one side to said frame web on the opposite side, said cells having walls providing stream flow between them, flexible sheet filtering material between adjacent cell walls and filling the stream flow space between them, said flexible sheet extending between said subframe members and said frame web for sealing purposes, and means supporting said flexible sheet filtering material and hold ing the same in said cell walls.

A lter panel having upstream and downstream faces and comprising a main frame surrounding the sides of said panel and open at said faces, separate hollow sub-frame members wholly unconnected with said main frame, each 6 of said sub-frame members being of channel section and of a length to extend from side to side of said main frame, each of said sub-frame members having open side walls and an imperiorate end wall and having out-turned flanges on said side walls at the open side of the channel, said sub-frame members being identical in shape and assembled in said main frame in alternately reverse position, one of said channels opening upstream and the adjacent channel on each side opening downstream, the out-turned lianges of one sub-frame member abutting against the end wall of adjacent sub-frame members, said sub-frame members completely lling said main frame, and ieXible sheet filtering material between adjacent side walls of said sub-frame members, said sheet material extending between said anges and end walls to provide sealing means there.

CLARENCE J. GLANZER. OLIVER H. SCI-IAAF.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATESl PATENTS Number Name Date 991,572 Weisenstein May 9, 1911 1,850,101 Greene Mar. 22, 1932 1,944,407 Dahlman Jan. 23, 1934 2,198,189 Vokes Apr. 23, 1940 2,255,519 Preston Sept. 9, 1941 2,286,479 Farr June 16, 1942 FOREIGN PATENTS Number Country Date 401,045 Great Britain Nov. 9, 1933 

